Capillarity is the ability of a liquid to flow in narrow spaces against the force of gravity or other external influences.
This phenomenon occurs due to the combination of cohesive forces between the liquid molecules and adhesive forces between the liquid and a solid surface, such as a tube or porous material.
Capillary action is observable when a liquid rises or falls in a narrow tube or permeable material, defying gravity. It is crucial in processes like water uptake by plant roots and the function of capillary tubes in various scientific instruments.
